/// <summary>
/// Indica a que lado esta el rectangulo respecto de la linea:
/// - Si == 0, toca la linea o la cruza.
/// - Si > 0 esta debajo/derecha de la linea.
/// - Si < 0 esta encima/izquierda de la linea.
/// </summary>
public LineSide WhichSide(BoundingBox2d r)
{
int[] sides = new int[3];
foreach (Point2d p in r.GetVertices())
{
LineSide lado = this.WhichSide(p);
sides[(int)lado]++;
}
if (sides[(int)LineSide.Middle] > 0)
{
// Toca la linea.
return(LineSide.Middle);
}
if ((sides[(int)LineSide.Left] > 0) && (sides[(int)LineSide.Right] > 0))
{
// Cruza la linea.
return(LineSide.Middle);
}
if (sides[(int)LineSide.Left] > 0)
{
// totalmente a un lado
return(LineSide.Left);
}
// if (sides[(int)Side.Right] > 0)
// totalmente a un lado
return(LineSide.Right);
}
public BoundingBox2d GetEnvelope(double d, double estacion1, double estacion2)
{
double t0 = this.t0;
double t1 = this.t1;
Vector2d v = this.dirN.PerpRight.Mul(d);
if (estacion1.EpsilonEquals(this.t0) && estacion2.EpsilonEquals(this.t1))
{
return(BoundingBox2d.Union(this.p0.Add(v), this.p1.Add(v)));
}
if (this.t0.EpsilonEquals(this.t1))
{
return(BoundingBox2d.Union(this.p0.Add(v), this.p0.Add(v)));
}
// Se normaliza la estacion.
double t01_0 = (estacion1 - this.t0) / (this.t1 - this.t0);
double t01_1 = (estacion2 - this.t0) / (this.t1 - this.t0);
return(BoundingBox2d.Union(
this.Evaluate01(t01_0).Add(v),
this.Evaluate01(t01_1).Add(v)));
}
public void TestWhichSideRectangle()
{
{
Line2d line = Line2d.NewNormal(new Point2d(0, 5), new Vector2d(1, 1));
Assert.IsTrue(line.WhichSide(BoundingBox2d.FromExtents(0, 0, 1, 1)) == LineSide.Right);
Assert.IsTrue(line.WhichSide(BoundingBox2d.FromExtents(0, 4, 2, 2)) == LineSide.Middle);
Assert.IsTrue(line.WhichSide(BoundingBox2d.FromExtents(0, 6, 1, 1)) == LineSide.Middle);
Assert.IsTrue(line.WhichSide(BoundingBox2d.FromExtents(0, 7, 1, 1)) == LineSide.Left);
}
}
public void TestInterseTouch()
{
{
BoundingBox2d bbox1 = new BoundingBox2d(0, 10, 0, 10);
BoundingBox2d bbox2 = new BoundingBox2d(5, 15, 5, 15);
Assert.IsFalse(bbox1.Touch(bbox2));
Assert.IsFalse(bbox2.Touch(bbox1));
}
{
BoundingBox2d bbox1 = new BoundingBox2d(0, 10, 0, 10);
BoundingBox2d bbox2 = new BoundingBox2d(5, 7, 5, 7);
Assert.IsFalse(bbox1.Touch(bbox2));
Assert.IsFalse(bbox2.Touch(bbox1));
}
{
BoundingBox2d bbox1 = new BoundingBox2d(0, 10, 0, 10);
BoundingBox2d bbox2 = new BoundingBox2d(0, 10, 0, 10);
Assert.IsTrue(bbox1.Touch(bbox2));
Assert.IsTrue(bbox2.Touch(bbox1));
}
{
BoundingBox2d bbox1 = new BoundingBox2d(0, 10, 0, 10);
BoundingBox2d bbox2 = new BoundingBox2d(10, 20, 10, 20);
Assert.IsTrue(bbox1.Touch(bbox2));
Assert.IsTrue(bbox2.Touch(bbox1));
}
{
BoundingBox2d bbox1 = new BoundingBox2d(0, 10, 0, 10);
BoundingBox2d bbox2 = BoundingBox2d.Empty;
Assert.IsFalse(bbox1.Touch(bbox2));
Assert.IsFalse(bbox2.Touch(bbox1));
}
{
BoundingBox2d bbox1 = BoundingBox2d.Empty;
BoundingBox2d bbox2 = BoundingBox2d.Empty;
Assert.IsFalse(bbox1.Touch(bbox2));
}
{
BoundingBox2d bbox1 = new BoundingBox2d(0, double.MaxValue, 0, double.MaxValue);
BoundingBox2d bbox2 = new BoundingBox2d(-double.MaxValue, 10, -double.MaxValue, 10);
Assert.IsFalse(bbox1.Touch(bbox2));
Assert.IsFalse(bbox2.Touch(bbox1));
}
}
public BoundingBox2d GetEnvelope(double t0, double t1)
{
if (t0.EpsilonEquals(this.t0) && t1.EpsilonEquals(this.t1))
{
return(BoundingBox2d.Union(this.p0, this.p1));
}
if (this.t0.EpsilonEquals(this.t1))
{
return(BoundingBox2d.Union(this.p0, this.p0));
}
// Se normaliza la estacion.
double t01_0 = (t0 - this.t0) / (this.t1 - this.t0);
double t01_1 = (t1 - this.t0) / (this.t1 - this.t0);
return(BoundingBox2d.Union(
this.Evaluate01(t01_0),
this.Evaluate01(t01_1)));
}
public void TestUnion()
{
{
BoundingBox2d bbox1 = new BoundingBox2d(0, 10, 0, 10);
BoundingBox2d bbox2 = new BoundingBox2d(5, 15, 5, 15);
Assert.IsTrue(bbox1.Union(bbox2).EpsilonEquals(new BoundingBox2d(0, 15, 0, 15)));
}
{
BoundingBox2d bbox1 = new BoundingBox2d(0, 10, 0, 10);
BoundingBox2d bbox2 = new BoundingBox2d(5, 7, 5, 7);
Assert.IsTrue(bbox1.Union(bbox2).EpsilonEquals(new BoundingBox2d(0, 10, 0, 10)));
}
{
BoundingBox2d bbox1 = new BoundingBox2d(0, 10, 0, 10);
BoundingBox2d bbox2 = new BoundingBox2d(0, 10, 0, 10);
Assert.IsTrue(bbox1.Union(bbox2).EpsilonEquals(new BoundingBox2d(0, 10, 0, 10)));
}
{
BoundingBox2d bbox1 = new BoundingBox2d(0, 10, 0, 10);
BoundingBox2d bbox2 = new BoundingBox2d(10, 20, 10, 20);
Assert.IsTrue(bbox1.Union(bbox2).EpsilonEquals(new BoundingBox2d(0, 20, 0, 20)));
}
{
BoundingBox2d bbox1 = new BoundingBox2d(0, 10, 0, 10);
BoundingBox2d bbox2 = BoundingBox2d.Empty;
Assert.IsTrue(bbox1.Union(bbox2).EpsilonEquals(new BoundingBox2d(0, 10, 0, 10)));
}
{
BoundingBox2d bbox1 = BoundingBox2d.Empty;
BoundingBox2d bbox2 = BoundingBox2d.Empty;
Assert.IsTrue(bbox1.Union(bbox2).IsEmpty);
}
{
BoundingBox2d bbox1 = new BoundingBox2d(0, double.MaxValue, 0, double.MaxValue);
BoundingBox2d bbox2 = new BoundingBox2d(-double.MaxValue, 10, -double.MaxValue, 10);
Assert.IsTrue(bbox1.Union(bbox2).EpsilonEquals(new BoundingBox2d(-double.MaxValue, double.MaxValue, -double.MaxValue, double.MaxValue)));
}
}
public static BoundingBox2d DoTransform(this ITransform2 transform, BoundingBox2d bbox)
{
return(BoundingBox2d.UnionOfPoints(bbox.GetVertices().Select(v => transform.DoTransform(v))));
}
